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I was Mrs. Peacock.
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The two of us together:
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The suspects were all given a sheet with clues written on it. The kids would enter a room (for example, I was stationed in the Dining Room) and make a guess. Something like, "Miss Scarlet did it in the Dining Room with the rope." I would then give them one clue based on what they said. All the clues were riddles. They would have to figure out the riddle, then go find that clue. (The riddle would lead them to the location of the clue.) As they found clues, they would check them off, thus narrowing down the list of suspects, locations, and weapons.
Would you believe that I'm a murderer?! I did it in the Hall with the wrench.
The kids all wore costumes to the game. We had some really fun costumes show up: Ace Ventura-Pet Detective, the Cat in the Hat with Thing 1 and Thing 2, a go-go girl, a pirate, a ladybug, Supergirl, Batgirl, a Chick Magnet (his t-shirt said "Chick Magnet" with Barbie dolls taped to it), Elizabeth Bennett, a cowgirl, Jimi Hendrix... There were more, but I'm drawing a blank right now. I'd love to show you pictures, but I don't feel right about posting kids' pictures on the internet without first getting parental permission. So, you can just imagine all the great costumes!
I forgot to mention that when the kids came to the suspects for clues, we had to make them do stuff for us first. Ruf made them bring him 3 skittles, which explained why I kept seeing kids run to the candy bowl, rifle through it, then race back from where they'd come. I made them spin like ballerinas, do cheerleading jumps, and sing the ABCs in operatic style. That was funny stuff!
It was a great way to spend Halloween!